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Enhancement for charset fallback.

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Fallback rule is defined in CHARSET_FALLBACK_MAP.
Multi-level fallback is supported.
This commit is contained in:
eagan 2013-02-16 19:11:34 +09:00 committed by cketti
parent 337487e2ae
commit a5f4ddae91
1 changed files with 22 additions and 5 deletions
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27
src/com/fsck/k9/mail/internet/MimeUtility.java
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@ -905,6 +905,16 @@ public class MimeUtility {
{"image/pjpeg", "image/jpeg"}, // see issue 1712
{"application/x-zip-compressed", "application/zip"} // see issue 3791
};
/**
* Table for charset fallback.
*
* Table format: not supported charset (regex), fallback
*/
private static final String[][] CHARSET_FALLBACK_MAP = new String[][] {
{"iso-2022-jp-[\\d]+", "iso-2022-jp"},
{".*", "US-ASCII"}
};
public static String unfold(String s) {
if (s == null) {
@ -2291,7 +2301,7 @@ public class MimeUtility {
charset = "shift_jis";
}
/*
* See if there is conversion from the MIME charset to the Java one.
* this function may also throw an exception if the charset name is not known
@ -2302,10 +2312,17 @@ public class MimeUtility {
} catch (IllegalCharsetNameException e) {
supported = false;
}
if (!supported) {
Log.e(K9.LOG_TAG, "I don't know how to deal with the charset " + charset +
". Falling back to US-ASCII");
charset = "US-ASCII";
for (int i = 0, len = CHARSET_FALLBACK_MAP.length; !supported && i < len; i++) {
if (charset.matches(CHARSET_FALLBACK_MAP[i][0])) {
Log.e(K9.LOG_TAG, "I don't know how to deal with the charset " + charset +
". Falling back to " + CHARSET_FALLBACK_MAP[i][1]);
charset = CHARSET_FALLBACK_MAP[i][1];
try {
supported = Charset.isSupported(charset);
} catch (IllegalCharsetNameException e) {
supported = false;
}
}
}
/*
* Convert and return as new String